Jung Hyung Don revealed he actually thought siblings TWICE's Jungyeon and Gong Seung Yeon were mother and daughter.

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On the October 26th episode of 'Weekly Idol', the members of TWICE showed up as guests, and during a break, Jung Hyung Don revealed he didn't know any of the members names. Defconn then asked Jung Hyung Don, "Do you know who Gong Seung Yeon is," referring to Jungyeon's older sister. 

Jung Hyung Don then pretended to know he knew of the actress, making everyone laugh by saying, "Aren't you Gong Seung Yeon's daughter?"